Here’s a fun list via Baseball-Reference.com. It’s Yankees, since 1954, who had 10+ games, within the team’s first 40 games of a season, where they had one or more homeruns in a game:

                   Year Games Link to Individual Games
+-----------------+----+-----+-------------------------+
 Mickey Mantle     1956    16 Ind. Games
 Tino Martinez     1997    13 Ind. Games
 Alfonso Soriano   2003    12 Ind. Games
 Alex Rodriguez    2007    12 Ind. Games
 Joe Pepitone      1969    12 Ind. Games
 Yogi Berra        1956    12 Ind. Games
 Tino Martinez     2005    11 Ind. Games
 Mickey Mantle     1967    11 Ind. Games
 Alex Rodriguez    2005    10 Ind. Games
 Jorge Posada      2003    10 Ind. Games
 Roger Maris       1960    10 Ind. Games
 Roger Maris       1961    10 Ind. Games
 Mickey Mantle     1957    10 Ind. Games
 Mickey Mantle     1961    10 Ind. Games
 Jason Giambi      2006    10 Ind. Games

I wonder if Robbie Cano can add his name to the list this season? He’s got four 1+ homer games now in the first twenty games of 2009…